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ClassDirectives.java
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ClassDirectives.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2016-2023 Objectionary.com
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.eolang.jeo.representation.asm;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Iterator;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Type;
import org.xembly.Directive;
import org.xembly.Directives;
/**
* Class printer.
* ASM class visitor which scans the class and builds Xembly directives.
* You can read more about Xembly right here:
* - https://github.com/yegor256/xembly
* - https://www.xembly.org
* Firther all this directives will be used to build XML representation of the class.
* @since 0.1
* @todo #84:30min Handle constructors in classes.
* Right now we just skip constructors. We should handle them in order to
* build correct XML representation of the class. When the method is ready
* remove that puzzle.
*/
@SuppressWarnings({"PMD.UseObjectForClearerAPI", "PMD.AvoidDuplicateLiterals"})
public final class ClassDirectives extends ClassVisitor implements Iterable<Directive> {
/**
* Bytecode listing.
*/
private final String listing;
/**
* Xembly directives.
*/
private final Directives directives;
/**
* Constructor.
* @param listing Bytecode listing.
*/
public ClassDirectives(final String listing) {
this(new DefaultVersion().api(), new Directives(), listing);
}
/**
* Constructor.
*/
ClassDirectives() {
this("");
}
/**
* Constructor.
* @param api ASM API version.
* @param directives Xembly directives.
* @param listing Bytecode listing.
*/
private ClassDirectives(
final int api,
final Directives directives,
final String listing
) {
super(api);
this.directives = directives;
this.listing = listing;
}
@Override
public void visit(
final int version,
final int access,
final String name,
final String signature,
final String supername,
final String[] interfaces
) {
final String now = ZonedDateTime.now(ZoneOffset.UTC)
.format(DateTimeFormatter.ISO_INSTANT);
this.directives.add("program")
.attr("name", name.replace('/', '.'))
.attr("version", "0.0.0")
.attr("revision", "0.0.0")
.attr("dob", now)
.attr("time", now)
.add("listing")
.set(this.listing)
.up()
.add("errors").up()
.add("sheets").up()
.add("license").up()
.add("metas").up()
.attr("ms", System.currentTimeMillis())
.add("objects");
this.directives.add("o")
.attr("abstract", "")
.attr("name", ClassDirectives.className(access, name));
super.visit(version, access, name, signature, supername, interfaces);
}
@Override
public MethodVisitor visitMethod(
final int access,
final String name,
final String descriptor,
final String signature,
final String[] exceptions
) {
final MethodVisitor result;
if (name.equals("<init>")) {
result = super.visitMethod(access, name, descriptor, signature, exceptions);
} else {
this.directives.add("o")
.attr("abstract", "")
.attr("name", ClassDirectives.methodName(access, name, descriptor));
if (Type.getMethodType(descriptor).getArgumentTypes().length > 0) {
this.directives.add("o")
.attr("name", "args")
.up();
}
this.directives.add("o")
.attr("base", "seq")
.attr("name", "@");
result = new MethodDirectives(
this.directives,
super.visitMethod(access, name, descriptor, signature, exceptions)
);
}
return result;
}
@Override
public void visitEnd() {
this.directives.up();
super.visitEnd();
}
@Override
public Iterator<Directive> iterator() {
return this.directives.iterator();
}
/**
* Class name.
* @param access Access.
* @param name Name.
* @return Class name.
* @todo #108:90min Implement different way to generate class name.
* Right now we use class name and access to generate class name and insert it as a name
* attribute of the class. This is not a good way to do it. At least it looks ugly.
* We should find a better way to generate class name and place it somewhere in the XML
* representation of the class.
*/
private static String className(final int access, final String name) {
return String.format("%d__%s", access, name);
}
/**
* Method name.
* @param access Access.
* @param name Name.
* @param descriptor Descriptor.
* @return Method name.
* @todo #108:90min Implement different way to generate method name.
* Right now we use method name, access and descriptor to generate method name
* and insert it as a name attribute of the method. This is not a good way to do it.
* At least it looks ugly. We should find a better way to generate method name and place
* it somewhere in the XML representation of the class.
*/
private static String methodName(final int access, final String name, final String descriptor) {
return String.format(
"%d__%s__%s",
access,
name,
descriptor
);
}
}